<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>练习</title>
  <style>
    #i1{
      color: #ff0000;
    }
    .c1{
      color: blue;
    }
    h1{
      background-color: yellow;
    }
    input{
      background-color: red;
    }
    *{
      background-color: pink
    }
  </style>
</head>
<body>
<ul>
  <li id="i1">张学友</li>
  <li class="c1">刘德华</li>
  <li>郭富城</li>
</ul>
<h1 class="c1">悟空</h1>
<h1>八戒</h1>
<h1>沙僧</h1>
<h1>刘备</h1>
<input type="text">
<input type="password">
</body>
</html>